Atoms_And_Theory

Atoms And Theory Atoms are basic building blocks of matter, and cannot be divided. Atoms are made up of three types of particles, protons, neutrons, and electrons. Protons and neutrons can be found in the nucleus. Protons have a positive charge, and neutrons have no charge, they are neutral. Electrons can be found in orbitals around the nucleus, they have a negative charge. To come to these conclusions, someone had to find them. Demicritus was a Greek philosopher around 400 B.C. Demicritus discovered that matter could not be divided into smaller pieces forever. This was his atomic theory, which is what we call the Greek Model. This was the first “unofficial” atomic theory. John Dalton was an English chemist who proposed the first atomic theory(Dalton Model). He stated that all elements are made up of indivisible particles. Atoms of the same element are exactly alike, and elements of different elements are different. Also that compounds are formed by two or more atoms joining together of different elements. JJ Thomson was an English scientist who discovered the atom in 1897. Thomson said that the atom was made of positively charged mass, electrons, ions, positive, atomic, model, deflected, atoms, atom, ion, nucleus, charged, ball, particles, elements, different, around, through, same, number, neutrons, force, first, deflection, charge, protons, path, magnetic, ionization, energy, element, electrically, depends, stated, spectrometer